Time lapse using RAW files stabilize image
by James Mulryan
on
Dec 3, 2008 at 10:54:23 pm
I am shooting time lapse footage with a Nikon D3, RAW files 4256X2832 pixels, 14 bit.
When I use a 500mm telephoto lens with a really beefy tripod to shoot sunsets, I getting frame vibration from wind hitting the lens. How can I stabilize the image in AE.
Also getting flicker due to exposure changes caused by changing cloud cover. How can I smooth out the exposure?
Importing RAW sequences into AE
Outputting to DVCPRHO HD 720 24p, importing into FCP.
Thank You.
James Mulryan
Sunset Park Media, LLC
Santa Monica, CA
info@jamesmulryan.com
Re: Time lapse using RAW files stabilize image by Dave LaRonde on Dec 3, 2008 at 11:18:26 pm
[James Mulryan]"I getting frame vibration from wind hitting the lens. How can I stabilize the image in AE."
Find stationary high-contrast points in image. Apply AE Motion Stabilizer to layer. Picture no move.
[James Mulryan]"How can I smooth out the exposure?"
You can TRY to fix it with the Color Stabilizer effect, but that implizes that you'd have part of the image with a consistent color.
Or ------ instead of trying to fix it in post, which can at best be a right royal pain and can at worst be impossible, and which can often yield less than satisfactory results, you could try something else. Use the lessons you just learned about shooting time-lapses, re-shoot and be much, Much, MUCH happier with the result. It's not like there will never be another sunset, y'know.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Re: Time lapse using RAW files stabilize image by Dave LaRonde on Dec 4, 2008 at 3:33:46 pm
[James Mulryan]"...Pretty tough to control wind on a really long lens, wind usually accompanies clouds."
It all depends on how you lock down the camera. If I really wanted a stabile shot using one of those big 'ol still camera lenses, and the wind shook the camera locked down on the tripod, I could only come to one conclusion: the tripod is inadequate for the task at hand.
There's nothing that says you HAVE to use a tripod. Think like McGyver, and brainstorm where to attach a mounting plate: a tree trunk, a retaining wall, the side of a building... you get the idea.
Likewise, there's nothing that says you have to use the tripod as intended. Can you lash it to telephone pole or a light pole? I bet you can come up alternate ways to use it.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Re: Time lapse using RAW files stabilize image by david bogie on Dec 4, 2008 at 9:32:34 pm
> When I use a 500mm telephoto lens with a really beefy tripod to shoot sunsets, I getting frame vibration from wind hitting the lens. How can I stabilize the image in AE.
Also getting flicker due to exposure changes caused by changing cloud cover. How can I smooth out the exposure?
Exposures are best controlled in camera. Time lapse has always been an issue with all shooters because of the scene changes. But that's part of shooting good stuff. You estimate the range of the exposures the time period will cover and make your best attempt and disable all auto functions because changing f-stops will affect depth of field.
Re: Time lapse using RAW files stabilize image by James Mulryan on Dec 5, 2008 at 4:55:55 am
Thanks bogiesan for all those great links.
Vibration control on a really long lens no matter how solid the mount is still an issue, wind will blow on the lens itself, and even mirror slap will induce vibrations. That is why I want to find a way to motion track the frame. The image itself is way bigger than HD so the edge of the can be fluid. Maybe Shake or something in the Apple family might be more appropriate.
James Mulryan
Sunset Park Media, LLC
Santa Monica, CA
info@jamesmulryan.com
Re: Time lapse using RAW files stabilize image by david bogie on Dec 5, 2008 at 3:43:35 pm
Image stabilization in AE is about as good as you will find anywhere. Sorry if I have misunderstood your AE fluency but the manual has an excellent section on using the tool. It's only confusing the first few times you try it and there are some great tutorials on image stabilization out there, easily googled.
You should be able to run an action in Photoshop to levelize your color and exposure values. I don't know how to do that myself but I know several PS wonks who can program actions in their sleep.